ASTM A709 is Recommended for
ASTM A709 is a carbon and high-strength low-alloy steel structural shape, and plate. It is quenched and tempered alloy steel, for structural plates meant for use in bridges.
We will be glad to help you select the exact grade of ASTM A709 steel plate for your needs.
- QST 50
- QST 50S
- HPS 50W
- QST 70
- HPS 70W
- HPS 100W
ASTM A709 Specifications
A709 is the standard specification for structural steel bridges. Covers carbon, HSLA, Q&T, and stainless steel plates, bars, and shapes for structural use in bridges. Includes grades 36, 50, 70, and 100, with designations for enhanced atmospheric corrosion resistance (W). Both fracture critical tension components and non-critical fracture tension components must meet impact requirements. These requirements are based on American Association of State Highway and Transportation Officials (AASHTO) requirements for tension components in bridges.
- Strength, Yield Strength ksi (MPa), Tensile Strength ksi (MPa): Stronger, 58-130 (400-900)
- Formability: % Elongation: Low for some grades, 14-21%
For better formability consider Drawing Steel
- Joining – Fair
Design and welding must account for stresses.
- Corrosion Resistance – Good
Galvanizing will slow corrosion. For longer life in harsh chemical conditions, consider Galvanized or Coated Steel
- Chemistry – Low carbon, high manganese and silicon, alloyed with copper, Chromium, Nickel, and Molybdenum
- Cost – Higher.
Good when thinner or stronger steels will add value.
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